Stone-cutting lathe.



F. A. GREARSON.

STONE CUTTING LATHE.

APPLIOATION FILED JUNE 28, 1910.

8-14 uewkva w mg xv Mucous informal;

COLUMBIA PLANOGRAPH c0.. wAsmNumN, u. c.

Patented Oct. 22, 1912.

F. A. GREARSON.

STONE CUTTING LATHE. APPLICATION FILED JUNE 28, 1910.

Patented Oct. 22, 1912.

2 SHEETSSHEET 2.

" nmmr Mum llll awuewtoz FREDERICK A. GREARSON, OF BARRE,

VERMONT, ASSIGNOR- 0F ONE-THIRD TO WILLIAS A. LANE, OF BARR-E, VERMONT.

STONE-CUTTING LATHE.

Specification of Letters Patent.

Patented Get. 22,1912.

Application filed June 28, 191.0. Serial No. 589,345.

To all whom "it may concern Be it known that I, FREDERICK A. GREAR- son,a citizen of the United States, residing at Barre, in the county ofYVashington and State of Vermont, have invented new and usefulImprovements in Stone- Cutting Lathes, of which the following is aspecification.

This invention relates to a lathe designed more especially for cuttingstone columns.

The invention has for one of its objects to improve and simplify theconstruction and operation of lathes of this character so as to bereliable and etlicient in use, and capable of trimming and finishing acolumn with great rapidity and with a minimum of wear on the cutters.

Another object of the invention is to provide a lathe having cuttersextending the full length of the work and automatically fed inwardly forcutting the work down to size, each consisting of a plurality of disksrotatably mounted on an arbor so as to revolve by contact with the work,and thereby produce a continuous cutting of the matter.

Another object of the invention is the provision of means forautomatically introducing a slight relative longitudinal movementbetween the cutters and work so as to insure the cutting of a smoothsurface.

With these objects in view and others, as will appear as the descriptionproceeds, the invention comprises the various novel features ofconstruction and arrangement of parts which will be more fully describedhereinafter and set forth with particularity in the claim appendedhereto.

In the accompanying drawings, which illustrate one embodiment of theinvention, Figure 1 is a plan view of the lathe with intermediateportions broken away. Fig. 2 is a side view thereof. Fig. 3 is a detailsection of one of the tool carriages and means for feeding the same.Fig. 4 is an end view of the cam wheel for moving the cutterlongitudinally. Fig. 5 is an elevation of the device shown in Fig. 4.

Similar reference characters are employed to designate correspondingparts throughout the views.

Referring to the drawings, A designates the bed of the lathe which hasat its ends the head stock B and the tail stock C that rotatably supportthe stone column or work. In the present instance, twooppositely-disposed cutters D are arranged to operate on the work, butit is to be understood that any desired number of cutters may beemployed. Each cutter consists of an arbor 1 that extends horizontallyand has its ends rotatably mounted in bearings 2 on carriages E. In thepresent instance, two carriages are shown at each side of the work, andmounted on the bed, the carriages being spaced apart a distanceapproximately equal to the length of the cutter supported thereby. Onthe arbor are arranged disks 3 that have peripheral ed es 4 that bearagainst the stone block or column to be trimmed, and by means of thisengagement, the cutter disks are rotated. The cutter disks may be ofdifferent shapes, according to the work to be done, and they may beclamped in any suit able manner to the arbors. It may be preferable toproduce relative longitudinal movement between the work and cutters sothat the forming of ridges in the work will be prevented, and for thispurpose each cutter may be provided at one end with a wheel 5 fastenedto the end of the arbor to rotate therewith, the said wheel having a camgroove 6 into which extends a finger 7 fastened to the adjacent bearing2, and on this finger is arranged a roller 8 which reduces the frictionbetween the finger and groove of the wheel. As the wheel rotates, thearbor will be moved back and forth longitudinally with respect to thework.

The cutters are automatically fed inwardly so as to cut down the columnto the proper size, and for this purpose rotary shafts 9 extendhorizontally along the front and rear of the bed and are journaled inbearings 10 on the latter, and at each carriage E the shaft 9 isprovided with a worm 11 which meshes with a gear wheel 12 on a screw 13that is journaled on the base 14 for the carriage E, the said screwbeing engaged in the nut 15 fixed to the sliding part of the carriage.The screws 13 operate simultaneously so that the cutter is fedtransversely to the lathe as the work rotates and as the result the workis gradually reduced in size. The shafts 9 can be rotated in anysuitable manner from the spindle of the lathe, as for instance bygearing 16 at the head stock end of the bed, which gearing rotatesstepped pulleys 17 that are connected by belts 18 with stepped pulleys19 on stub shafts 20, which stub shafts are flexibly connected with theworm shafts 9. In a lathe of this construction, the work can be cut tothe desired size with great rapidity and the feed takes placeautomatically so that no attention is required on the part of theattendant during the cutting operation, except the initial adjusting ofthe work and cutters and stopping of the machine at the proper time,

From the foregoing description, taken in connection with theaccompanying drawings, the advantages of the construction and of themethod of operation will be readily apparent to those skilled in the artto which the invention appertains, and while I have described theprinciple of operation of the invention, together with the device whichI now consider to be the best embodiment thereof, I desire to have itunderstood that the device shown is merely illustrative, and that suchchanges may be made when desired as are within the scope of the claimappended hereto.

Having thus described the invention, What I claim as new, is

A stone cutting machine comprising su-pports forming guides, a headpiece having a shaft and rotatable on one of said supports, a tail pieceadjustable on said supports, members adjustable on said guide ways andprovided with transverse guide ways, hearing blocks movable on saidtransverse guide ways, shafts journaled on said bearing blocks andprovided with a plurality of contacting cutter disks having bevelededges, a wheel carried by each of said shafts and provided with a camgroove, a finger disposed in each of said cam grooves for longitudinallyreciprocating said shaft, screws for moving said bearing blocks, theshafts having worms cooperating'with said screws, gearing operating withthe shaft of the head piece, flexible means connected wit-h said shaftsadapted to permit of their adjust ment and means connected with saidgearing 4 for driving said flexible means.

In testimony whereof I aflix my signature in presence of two witnesses.

FREDERICK A. GREARSON. Witnesses EARLE R. DAVIS, JAMES W. GnEARsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

